export declare class BaseCoder {
    private _valid_encoding_pattern;
    constructor({ valid_encoding_pattern }: {
        valid_encoding_pattern: RegExp;
    });
    decode(encoding: string): Uint8Array;
    decodeTrusted(_encoding: string): Uint8Array;
    encode(bytes: Uint8Array): string;
    encodeTrusted(_bytes: Uint8Array): string;
    isValidBytes(bytes: unknown): bytes is Uint8Array;
    isValidEncoding(encoding: unknown): encoding is string;
}
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